I get the same effect of screen blank on memory scrub. Just as a test try turning off the memory scrub in the xen boot options. I wonder if xen overwrites the video-ram memory as its cleaning up. On 02/22/2016 01:06 PM, Scot P. Floess wrote: > Francis, > > I just rebooted my Precision 470 and watched...nothing :( > > I see the boot menu, and then everything goes blank - as in just a > blinking cursor until I get the login prompt. > > No idea what it's doing - but I don't even see the scrubbing free > memory output... > > On Mon, 22 Feb 2016, Francis Greaves wrote: > >> Yes I usually work headless, but I have been setting it up from new, >> so need to see what is going on. >> Regards >> Francis >> >> >> _________________________________________________________________________________________________________________________________________________________ >> >> From: "Scot P. Floess" <sfloess at nc.rr.com> >> To: "Francis Greaves" <francis at choughs.net> >> Cc: "centos-virt" <centos-virt at centos.org> >> Sent: Monday, 22 February, 2016 17:02:12 >> Subject: Re: [CentOS-virt] Garbled screen after RAM Scrub on boot >> >> When I was running Fedora 23 and using Xen (as the host OS), I saw >> something similar on my Dell Precision 470. I don't recall seeing it >> now >> with CentOS 7, but I tend to boot that machine headless more than not... >> >> On Mon, 22 Feb 2016, Francis Greaves wrote: >> >> > Dear All >> > I am using Centos 7 with Xen 4.6 on a Dell Poweredge T430 >> > When the machine boots, after the 'Scrubbing Free RAM' message, I >> get a screen filled with little white squares until the login prompt, >> so I cannot see >> > what is happening as the machine boots. Also there is nothing on >> the screen when I reboot. >> > >> > My /etc/default/grub is >> > >> > GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" >> > GRUB_DEFAULT=saved >> > GRUB_DISABLE_SUBMENU=true >> > GRUB_CMDLINE_LINUX="crashkernel=auto rhgb intremap=no_x2apic_optout" >> > GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=13312M,max:14336M >> dom0_max_vcpus=6 dom0_vcpus_pin" >> > GRUB_GFXMODE=1024x768 >> > GRUB_GFXPAYLOAD_LINUX=keep >> > GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="console=hvc0 >> earlyprintk=xen nomodeset" >> > >> > I have tried setting (for a 1024x768 resolution) vga=792 in the >> GRUB_CMDLINE_LINUX and commenting out GRUB_GFXMODE and >> GRUB_GFXPAYLOAD_LINUX, but this >> > makes no difference >> > >> > What am I doing wrong? >> > >> > Regards >> > Francis >> > >> > >> >> Scot P. Floess RHCT (Certificate Number 605010084735240) >> Chief Architect FlossWare http://sourceforge.net/projects/flossware >> http://flossware.sourceforge.net >> https://github.com/organizations/FlossWare >> >> > > Scot P. Floess RHCT (Certificate Number 605010084735240) > Chief Architect FlossWare http://sourceforge.net/projects/flossware > http://flossware.sourceforge.net > https://github.com/organizations/FlossWare > > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > https://lists.centos.org/mailman/listinfo/centos-virt -- Alvin Starr || voice: (905)513-7688 Netvel Inc. || Cell: (416)806-0133 alvin at netvel.net || -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20160222/91c80515/attachment-0006.html>